It looks quite a substantial house, and with so many staff the family must have been pretty well-heeled, though they don't look to be wearing anything particularly fancy.

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I've had to spend a bit of time expanding the research on the Portlock side of the family to see if I can identify this family. Alas as yet I've drawn a blank. My best guess is that this is a household that one of the family served at some point and could very well be one of the servants pictured.